Abstract
The effect of the current density profile on the limit of the safety factor q (a) in the non-circular tokamak TNT-A is described in this paper. The safety factor q (a) is measured by magnetic probes and one-turn loops. The current density profile is estimated from the shape of the plasma boundary with an equilibrium code. A gas puffing system and pulse forming network (PFN) circuit for the Joule current are used to control the profile. The limit of q (a) increases from 2.6 to 4.0 as the current density profile becomes flatter and the current density profile parameter enters the unstable region for the m =3 and 4 external kink modes. This limit of q (a) determines one of the boundary of the operational stable region in TNT-A.
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